Prison Section Door

[Grimstoll]

If you're willing to use the model editor i suppose you could open the prison section door, (save as a new entity called prison_section_YOURNAMEHERE.ent) click on the hinges, check 'Disable Visible Mesh' (or something similar) and delete the hinge body. then delete the hinge_constraint. You can then test the entity by pressing the cogwheels at the bottom. The door should move freely, as if not on hinges.

Then you can use palistov's suggestion, but instead of using setprophealth(0); you use SetEntityActive("prison_section_mycustomentity" , true);

Edit: There is already a prison_section_broken.ent, just use SetEntityActive("prison_section_broken" , true); after three or four hits.
Also it seems there is no 'Disable Visible Mesh' checkbox, even though i'm positive i saw one earlier...

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Nevermind, you've already tried that, maybe try going into model editor>settings>uservariables and make sure that the entity which spawns on break is prison_section_broken.ent